1020049999 has 4 divisors (see below), whose sum is σ = 1043772136. Its totient is φ = 996327864.

The previous prime is 1020049993. The next prime is 1020050033. The reversal of 1020049999 is 9999400201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9999400201 = 7 ⋅1428485743.

It is a cyclic number.

It is not a de Polignac number, because 1020049999 - 2⁵ = 1020049967 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 23722093 = 1020049999 / (1 + 0 + 2 + 0 + 0 + 4 + 9 + 9 + 9 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020049993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11861004 + ... + 11861089.

It is an arithmetic number, because the mean of its divisors is an integer number (260943034).

Almost surely, 2^1020049999 is an apocalyptic number.

1020049999 is a deficient number, since it is larger than the sum of its proper divisors (23722137).

1020049999 is an equidigital number, since it uses as much as digits as its factorization.

1020049999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23722136.

The product of its (nonzero) digits is 52488, while the sum is 43.

The square root of 1020049999 is about 31938.2216004586. The cubic root of 1020049999 is about 1006.6391570459.

The spelling of 1020049999 in words is "one billion, twenty million, forty-nine thousand, nine hundred ninety-nine".